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1, 1, 1, 2, 5, 17, 51, 199, 653, 2746, 9506, 41887, 150209, 683534, 2513812, 11714529, 43913589, 208460660, 793362271, 3822998161, 14731492719, 71883765642, 279923388563, 1380780426067, 5426284435421, 27023956574169, 107069182011993, 537876237669664
(列表;图表;参考;听;历史;文本;内部格式)
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